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Influence of neutron and gamma-ray irradiations on rad-hard optical fiber

Abstract : We investigated point defects induced in rad-hard Fluorine-doped optical fibers using both a mixed source of neutrons (fluences from 1015 to 1017 n/cm2) and γ-rays (doses from 0.02 to 2 MGy) and by a γ-ray source (dose up to 10 MGy). By combining several complementary spectroscopic techniques such as radiation-induced attenuation, confocal micro-luminescence, time-resolved photo-luminescence and electron paramagnetic resonance, we evidenced intrinsic and hydrogen-related defects. The comparison between the two irradiation sources highlights close similarities among the spectroscopic properties of the induced defects and the linear correlation of their concentration up to 1016 n/cm2. These results are interpreted on the basis of the generation processes of defects from precursors sites, that are common to both γ-rays and neutrons. In contrast, the highest neutron fluence (1017 n/cm2) causes peculiar effects, such as the growth of a photoluminescence and variations of the spectral and decay properties of the emission related with nonbridging oxygen hole centers, that are likely due to silica network modification.
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Contributor : Sylvain Girard <>
Submitted on : Friday, August 21, 2015 - 3:53:42 PM
Last modification on : Thursday, January 30, 2020 - 9:30:03 AM

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Adriana Morana, Sylvain Girard, Marco Cannas, Emmanuel Marin, Claude Marcandella, et al.. Influence of neutron and gamma-ray irradiations on rad-hard optical fiber. Optical Materials Express, OSA pub, 2015, 5 (4), pp.898-911. ⟨10.1364/OME.5.000898⟩. ⟨ujm-01185827⟩



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